Insulator for electric wires.



PATENTED MAY 5, 1903.

J. R. B INSULATOR FOR APPLICATION r1 BLE RIC WIRES ED JUNE 28 1 2anoentog 6% M (It may UNITED STATES Patented May 5, 1903.

JQSEPI-I R. BELL, OF PECKVILLE, PENNSYLVANIA.

INSULATOR FOR ELECTRIC WIRES.

SPECIFICATION forming part of Letters Patent N0. 726,84 8, dated May5,1903. Application filed June 28, 1902. $e1'ial No. 113,683. o mode -l T0all'whom, it non/y concern:

Be it known that I, JOSEPH R. BELL, a citizen of the United States,residing at Peckville, in the county of Lackawanna and State ofPennsylvania, have invented certain new and useful Improvements inInsulators for Electric Wires, of which the following is aspecification.

This invention relates to insulators such as are used for stringingtelegraph and telephone wires to poles, and has for its objects toobviate the necessity of tying wire, to pro vide a more secure andperfect attachment of the wires to the insulator, to simplify andfacilitate the attachment to the insulator, to prevent the relaxation ofwires by the process of fastening, to take up. the slack in the wires,and other objects, as are herein specified, and moreparticularly'pointed out in the claims.

To these ends the invention consists of the construction, arrangement,and combination of parts, as herein set forth, and shown in thedrawings, in which Figure 1 is a side elevation of an exterior View ofone of my insulators with a wire attached, parts being broken away tomore fully show the position of the wire. Fig. 2 is a View incross-section, taken on the line x a: of Fig. 1, the wire being removed.Fig. 3 is a side elevation of the body portion of one of my insulators,taken at right angles to that of Fig. 1. Fig. 4 is a-view, partially incrossseotion, taken on the line g of Fig. 1.

Similar characters of reference denote like and corresponding partsthroughout the several views.

In the drawings, 1 denotes the lower or body portion of one of myinsulators, and 2 denotes an upper or cap piece which is designed to besecured to the said body portion by means of the screw-threaded shank 3.The body portion is also provided with screwthreads 4, by means of whichit is adapted to be secured to a wooden peg in the usual manner.

The screw-threaded shank 3 is divided into lugs 4 and 5 by means of adeep channel carrying the wire 6. The said channel has converging, sides7 and 8, one of said sides being provided with a central fret 9 and theother side being provided with frets 10 and 11, by means of which thewire to be secured is kinked at its contacts with the said three frets,and it is arranged to be pressed down into bending contact with the saidfrets by means of the rim or petticoat 12 of the cap aforesaid. A recess14 is provided at opposite ends of the channel for the wire 6, and whenthe cap is screwed down to its place the rim or petticoat l2 compressesthe wire 6 into said recesses 14 at opposite sides, thus kinking thewire at 13 13, and thereby assisting to hold it secure in its position.The main or body portion of theinsulator is provided with the usualpetticoat 15 and is provided with a tying-wire groove 16 to attachtapping-lines or branch lines by means of tying-wire and also for anemergency in case the cap or other parts of the insulator should'becomebroken. The cap has asimilar groove 17.

In attaching a wire to the insulator the Wire to be attached is drawnina taut position in the vicinityof the insulator and in this position islaid into the channel provided for it. The cap is then inserted andscrewed downward and by means of the impinging rim 12 on the wire forcesit downward,'so that the frets 9, l0, and 11 aforesaid indent the wirewith lateral bends. When the wire is taut, these bends will have atendency to increase the tension upon it, and the cap 2 is held securefrom turning by reason of the upward tension of the strained wire onthe'rim 12 aforesaid. Where the wire is sufficiently taut, very littlebending will take place in the vicinity of 13 13; .but should the wirebecome somewhat loosened additional screwing down of the cap 2 will takeup the slack by causing the bends 13 13, as before mentioned.

l-Iavingthus described my invention, what I claim, anddesire to secureby Letters Patout, is

1.- The herein-described insulator consisting'of a body portion, ascrew-threaded shank, a channel through said shank, the sides of saidchannel converging downward, and the said converging sides having fretsthereon arranged to engage the wire when compressed within said channel,together with a cap arranged to be screwed onto said shank, and tocompress the wire within said channel, substantially as and for thepurpose specified.

2. In an insulator of the kind described, a body portion adapted to besecured to a peg, the upper end thereof terminating in a holding-shank,the said shank having a channel with converging sides, frets on thesides of said channel arranged in alternate positions for the purpose ofkinking the wire to be held therein, substantially as and for thepurpose specified.

3. An insulator comprised in a body portion having a channel withconverging sides arranged to receive the wire to be insulated, theconverging sides of said channel having frets running in the directionof the convergence and arranged in alternate positions, a cap arrangedto be secured over said body portion, the edges of the cap extendingover the openings of the channel aforesaid, whereby the Wire inserted insaid channel is compressed into a tortuous shape, substantially asspecifled.

4. An insulator of the kind described comprised in a main or bodyportion substantially cylindrical in form having aninternallyscrew-threaded recess in one end thereof, and a channeledshank at the opposite end thereof, the sides of said channel in saidshank converging, frets on the sides of said channel arranged inalternate positions, screw-threads on the exterior of said shank, and acap having interior screw-threads arranged to engage with the shankaforesaid and adapted when screwed on to compress the wire.

In testimony whereof I affix my signature in presence of two witnesses.

JOSEPH R. BELL.

\Vitnesses:

P. P. SMITH, D. G. MORAN.

